Create README.md
Updates NuGet packages.
Moves all MVC dependencies from core assemblies to a separate assembly.

I still need to add DNOA.Mvc to some build and package authoring.
Adds DNOA.Mvc to the standard shipping projects.
Fixes build with new DNOA.Mvc
Fixes runtime dependencies for MVC 5.
Retargets DNOA to MVC 5. Fixes #307
Sets up version number for next release.
Updates to NuGet.exe v2.7.1.
Fixes NuGet build break.
Includes DNOA.Mvc NuGet package in DNOA.
Fixes strong name signing of unified assembly.
Removes unified assembly, since it's fundamentally broken due to anonymous type name collisions from the async methods that are now in the various assemblies.
Removes delay-signing build authoring leftovers that was still breaking the build.
Fixes package dependency on WebApi.
Increments version
Applies fix for #209 to one more entrypoint for parsing XML that was missed initially.
Removes inappropriate input validation of the signingKey argument in the AccessToken.CreateFormatter method.
This was breaking ResourceServer scenarios where the ResourceServer did not have the authorization server's private signing key.

Fixes #298